Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 309 ms

HostCertsFirst seenLast seen
vivus.pl 12 2026-06-01 2026-09-28
client.vivus.pl 11 2026-05-31 2026-09-26
www.vivus.pl 7 2026-06-01 2026-09-27
ex.vivus.pl 6 2026-05-21 2026-09-15

Programmatic access: API GET /v1/hosts/vivus.pl (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/vivus.pl.